I agree with Turnbull. But I think people underestimate mafiosi of a later era. From the 80's mafiosi had a much harder time staying out of the can.

Vincent Gigante was the boss of the most powerfull family from the early 80's till the late 90's in freedom. Finally, after 25 years he went to the can because of Gravano's testimony..

The Bonanno-family was heavily weakened after Donnie Brasco but Massino made it one of the most powerfull families in the US (maybe only except the Genoveses). The he went to the can because the testimony of his friend, brother-in-law and underboss. Of course, becoming a rat made him one of the worst mob-bosses ever.